How we can separate two sulphide ores by froth flotation process? Explain with an example

 How we can separate two sulphide ores by froth flotation process? Explain with an example.

Ans. 
          Two sulphide ores can be separated by adjusting the proportion of oil in water or by using depressants. For example, if an ore contain ZnS and PbS, a depressants NaCN is added so that it forms a complex with ZnS and prevents it from coming to the fort. On  the other hand, PbS comes into the forth and get separated.

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